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Zip Code 95503 — Eureka, CA

95503 is a ZIP Code associated with Eureka, CA, located within Humboldt. The postal region supports an estimated population of 25,054 residents across Data Pending housing units, with a population density of 115.5 people per square mile.
WorldPlaceData database updated: October 2026

📍 View location on OpenStreetMap (40.724060, -124.091780)

Data MetricLocal Statistic
Postal / Zip Code95503
Primary CityEureka
State / ProvinceCA
CountyHumboldt
Total Population25,054
Median Household IncomeData Pending
Total Housing UnitsData Pending
Population Density115.5 people/sq mi
TimezoneAmerica/Los_Angeles

How 95503 Compares

MetricZIP 95503Humboldt CountyCA State Average
Population25,054134,80939,286,245
Median IncomeData PendingN/AN/A
Population Density115.5 /sq mi----

Nearby ZIP Codes

ZIP CodeCityDistancePopulationMedian Income
Zip 95501Eureka6.1 mi22,890N/A
Zip 95537Fields Landing6.6 mi532N/A
Zip 95524Bayside7.2 mi1,634N/A
Zip 95564Samoa7.4 mi444N/A
Zip 95551Loleta7.7 mi1,880N/A

Data Sources & Methodology: Geographic coordinates and ZIP Code assignments are derived from underlying geographic and postal datasets. Note that ZIP Codes are USPS postal delivery areas, while Census ZCTAs are statistical approximation areas. Read full methodology →